I'm in the process of updating the links to archive.wizards.com instead of the now-defunct links to the main site. I've gotten through the first 5 non-index posts so far. WotC didn't manage to archive all of the material (notably the stuff around the transition to 4th edition, but some pages just got bugged and skipped archiving or were corrupted). I'm going through the links as I update them and am noting which ones don't work. Hopefully I'll be able to find them all on some other archive site with archive.org and provide those links, too.
Edit: Working links are updated. I might start looking for external archive and cache links later, but probably not tonight. Right now I plan to resort some of the links so things are easier to find, then maybe work in the unsorted material I've got down at the bottom of the first page.